JP2602775Y2 - Clamp tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp bit for detachably fixing a throw-away tip for processing a metal material or the like to a tip portion of a holder.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional clamp bit is a throw-away tip (hereinafter, abbreviated as a tip).
A type in which A is fixed by a clamp screw C, or a type in which the chip A is pressed from above by a top clamper D as shown in FIG.

[0003]

2. Description of the Related Art However, the above prior arts include:
There were the following problems.

That is, the clamp bit by the clamp screw C has a small restraining force of the tip A, and furthermore, when the tip A is replaced, the clamp screw C must be completely removed and it takes time, so that the working efficiency is reduced. There was a problem that it got worse. Further, at the time of the replacement, the screw C may be lost.

[0005] Next, the clamp bit by the top clamper D has a larger restraining force than that by the clamp screw C. However, especially in the case of inner diameter machining, chips hit the clamper D protruding to the outside, which hinders discharge. In some cases, this could cause chip intrusion or damage to the machined surface.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pocket having an inclined bottom surface having an opening angle of 5 ° to 45 ° and opening on a side surface below a mounting surface of a throw-away tip. A pin member is fitted into the pocket, and the tip of the pin presses the hole wall of the through hole formed in the throw-away tip, and moves forward and backward in the pocket in a direction substantially parallel to the inclined bottom surface. Then, the member is restrained by a fixing bolt whose front end portion is screwed to the holder to clamp the throw-away tip.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a clamp bit 1 according to the present invention. The clamp bit 1 for machining an inner diameter has a tip seat portion 4 on which a tip 3 is placed at a tip end portion of a holder 2, and a concave portion.
Further, a pocket 5 having an inclined bottom surface 5a is formed so as to be open to the side surface below the chip mounting surface and penetrate through the chip seat portion 4 to have a concave bottom surface 5a. The pocket 5 of the holder 2 has an inclined lower surface 6 corresponding to the inclined bottom surface 5a.
a, and a block-shaped pin member 6 formed by forming a cylindrical pin 6b on the upper surface 6c as a whole, is fitted.
The front end portion is formed on the abutment surface 5b of the pocket 5 while moving the fixing bolt B through a bolt insertion hole 6e formed on one side surface 6d side in a direction substantially parallel to the inclined bottom surface 6a. The pin member 6 is screwed into the bolt hole N to fix the pin member 6 in the pocket 5.

As for the shape of the holder 2 where the pocket 5 is formed, a stopper 2b is formed on the side surface of the holder 2 so that the pin member 6 does not shift upward and laterally. Preferably, on the other hand, a recess 6f is formed in the pin member 6 so as to correspond to this.

As shown in FIG. 2, the pin 6b is formed with a jaw 6g protruding forward of the upper end peripheral portion, and has an annular tapered surface 3 recessed around the through hole 3a of the chip 3.
b is pressed by the jaw 6g.

FIGS. 3 and 4 show an operation procedure for mounting the chip 3 by the clamp bite 1.
The pin member 6 is fitted into the pocket 5 formed in the holder 2 with the pin 6b of the pin member 6 inserted through the through hole 3a. At this time, the inclined lower surface 6a of the pin member 6 slides on the inclined bottom surface 5a of the pocket 5, and the tapered engagement causes the pin member 6 to move diagonally downward as it goes deeper. As a result, the pin 6b also moves obliquely downward, and finally the jaw 6g strongly presses the annular tapered surface 3b of the chip 3 by the tightening force of the fixing bolt B. The portion 4 is brought into close contact with the bottom surface 4a and the side surface 4b, and is fixed.

As shown by an arrow in FIG. 4, a stress W acting in the direction of the side surface 4b of the chip seat portion 4 is used for fixing the chip 3.
_Since a stress is applied in _two directions, i.e., a stress W2 acting in the direction of ₁ and the bottom surface 4a, a stronger fixing force is obtained.

Further, the pin member 6 is accommodated in the pocket 5 of the holder 2, that is, in the holder 2, and does not protrude outside the holder 2, so that there is no hindrance to chip discharge during cutting. Therefore, it is possible to discharge chips smoothly.

The inclination angle of the inclined surface 5a of the pocket 5 is preferably 5 ° to 45 °, and if the inclined angle is smaller than 5 °, the side surface 4b
Too small stress W ₁ acting on, also more than 45 ° when too small stress W ₂ acting in the direction of the tip seat 4a, during cutting chip 3 is Te blur, blur the cutting surface Can occur.

Next, a procedure for removing and replacing the chip 3 will be described. The fixing bolt B is loosened by rotating the fixing bolt B several times using a hexagon wrench (not shown), and the pin member 6 is slightly tilted upward. Then, the engagement between the jaw 6g of the pin 6b and the annular tapered surface 3b of the tip 3 is released, and the tip 3 is removed from the holder 3. Then, in order to mount a new chip 3 subsequently, it is only necessary to fit the chip 3 around the pin 6b in this state, push the pin member 6 obliquely downward, and apply the fixing bolt B.

As described above, according to the clamp bite 1, the tip 3 can be quickly, firmly and stably mounted, and the machining efficiency is high.

The shape of the pin 6b of the pin member 6 is not limited to the one shown in the drawing, but may be one without the jaw 6g.
In place of the annular tapered surface 3b shown in the figure, a stepped portion or a portion without such a portion may be used. In short, the pin 6 formed on the pin member 6 Any structure may be used as long as the tip portion presses the hole wall of the through-hole 3a of the throw-away tip 3 or the vicinity of the through-hole 3a.

[0018]

As described above, according to the present invention, according to the present invention, a pocket having an inclined bottom surface having an inclination angle of 5 ° to 45 ° is opened on the side surface below the mounting surface of the above-mentioned throw-away tip. The pin member is fitted, and the tip end portion of the pin is configured to press the hole wall of the through hole formed in the throw-away tip, and moves forward and backward in the pocket in a direction substantially parallel to the inclined bottom surface. By fixing the tip with a fixing bolt screwed into the holder and clamping the throw-away tip, the tip can be fixed with a very large restraining force, and the pin member can be fixed to the holder. Housed within
Since it does not protrude outside the holder, it does not hinder chip discharge during cutting. Therefore, it is possible to discharge chips smoothly.

Further, since the tip can be replaced by loosening and tightening the fixing bolt by a very small amount, the tip can be quickly and securely replaced, and the tip can be stably mounted, so that the processing efficiency is high.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a clamp tool according to the present invention.

FIG. 2 is a side view of a pin member constituting the clamp bite of FIG. 1;

FIG. 3 is a side view showing a distal end portion of the clamp tool of FIG. 1;

FIG. 4 is a side view showing a distal end portion of the clamp bite shown in FIG. 1;

FIG. 5 is a sectional view showing a distal end portion of a conventional clamp bite by a clamp screw.

FIG. 6 is a cross-sectional view showing a tip portion of a conventional clamp bite by a top clamper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp bite 2 Holder 2a Side surface 2b Stopper 3 (Throw-away) Tip 3a Through hole 3b Annular taper surface 4 Tip seat 4a Bottom surface 4b Side surface 5 Pocket 5a Inclined bottom surface 5b Butt contact surface 6 Pin member 6a Inclined bottom surface 6b Pin 6c Top surface 6d side surface 6e Bolt insertion hole 6f Recess 6g Jaw B Fixing bolt N Fixing hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A clamp tool for detachably fixing a throw-away tip to a tip portion of a holder, the clamp bit having an opening angle on a side surface below a mounting surface of the throw-away tip and having an inclination angle of 5 ° to 45 °. A pin member is fitted into a pocket having an inclined bottom surface, and a tip end portion of the pin presses a hole wall of a through-hole formed in the throw-away tip. A clamp bit which clamps the throw-away tip by restraining the member by a fixing bolt whose front end portion is screwed to the holder while moving in a parallel direction.